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 * The Universal Permissive License (UPL), Version 1.0
 *
 * Subject to the condition set forth below, permission is hereby granted to any
 * person obtaining a copy of this software, associated documentation and/or
 * data (collectively the "Software"), free of charge and under any and all
 * copyright rights in the Software, and any and all patent rights owned or
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 * unmodified Software as contributed to or provided by such licensor, or (ii)
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 * (a) the Software, and
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 * (b) any piece of software and/or hardware listed in the lrgrwrks.txt file if
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package org.graalvm.nativebridge;

import java.io.IOException;
import java.nio.ByteBuffer;
import java.util.Objects;

import org.graalvm.nativebridge.ProcessIsolateThreadSupport.Result;
import org.graalvm.nativebridge.ProcessIsolateThreadSupport.ThreadChannel;

import org.graalvm.nativebridge.BinaryOutput.ByteArrayBinaryOutput;

import static org.graalvm.nativebridge.ForeignException.GUEST_TO_HOST;
import static org.graalvm.nativebridge.ForeignException.HOST_TO_GUEST;

/**
 * Represents an entered process isolate thread.
 *
 * @see ProcessIsolate#enter()
 */
public final class ProcessIsolateThread extends AbstractIsolateThread {

    private final ProcessIsolate isolate;
    final ThreadChannel threadChannel;

    ProcessIsolateThread(Thread thread, ProcessIsolate isolate, boolean foreignThread, ThreadChannel threadChannel) {
        super(thread, foreignThread);
        this.isolate = Objects.requireNonNull(isolate, "Isolate must be non-null");
        this.threadChannel = threadChannel;
    }

    @Override
    public ProcessIsolate getIsolate() {
        return isolate;
    }

    /**
     * Sends a request to execute a foreign method in another process and waits for the response. If
     * the requested operation triggers a callback (up-call) to the caller process, the request is
     * transparently handled by the {@code sendAndReceive} method.
     *
     * @param message the marshalled request
     * @return the marshalled response
     * @throws IsolateDeathException if an I/O error occurs while communicating over the socket
     * @throws ForeignException if the foreign method throws an exception
     */
    public BinaryInput sendAndReceive(ByteArrayBinaryOutput message) {
        ByteBuffer buffer = ByteBuffer.wrap(message.getArray(), 0, message.getPosition());
        Result result;
        try {
            result = threadChannel.sendAndReceive(buffer);
        } catch (IOException ioe) {
            throw new IsolateDeathException(ioe);
        }
        if (result.success()) {
            return BinaryInput.create(result.payload().array());
        } else {
            byte[] data = result.payload().array();
            byte kind = getIsolate().isHost() ? HOST_TO_GUEST : GUEST_TO_HOST;
            throw ForeignException.create(data, kind);
        }
    }
}
